Any number will be a rational number when multiplied.0 multiplied by any real number is rational and so it will produce a rational number when multiplied.
If x is any non-zero number (rational or not), then since it is non-zero, 1/x is defined and x*(1/x) = 1 which is rational. So any non-zero number will produce a rational number when multiplied.
Thus any number will produce a rational number when multiplied.
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The product of two rational numbers is a rational number. All decimal numbers that terminate or end with a repeating sequence of digits are rational numbers. As both 0.54732814 (as written) and 0.5 are terminating decimals, they are both rational numbers. As 0.54732814 is a rational number and 0.5 is a rational number, their product will also be a rational number.
Every rational number does.
Any other rational number.
If an irrational number is added to, (or multiplied by) a rational number, the result will always be an irrational number.
all rational numbers can be written as fractions. That is the definition of rational numbers.